The mercury level in a simple barometer falls gradually, at constant temperature indicates that

weather gradually changes to summer.

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weather gradually changes to rainy.

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weather changes to an anti-cyclone one.

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weather gradually changes to winter.

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Solution

The correct option is B weather gradually changes to rainy.
Solution
Fall of mercury in Barometer at constant temperature means There is fall in pressure of the area.
Fall in pressure is created due to low pressure which means there is moisture content in air and it can be rainy.
The correct option is B.

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